JPH0364359B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a structure of a keel and a wing provided below the bottom of a small boat such as a yacht, which stabilizes the boat and improves the stability of the boat.
In particular, it relates to technology that improves stability against heels.

[Conventional technology]

In recent years, a small boat such as a yacht has been developed with a wing plate fixed in a substantially horizontal position below the keel to improve stability by generating downward force from the wing during running. It has been.

[Problem that the invention seeks to solve]

With conventional hulls in which the wing is fixed below the keel, when the boat is running in waves or winds that are not very strong, the downward force from the wing acts sufficiently to enable stable running, but in strong waves or strong winds When the hull heels significantly, the wing stands vertically, the direction of the force generated on the wing tilts horizontally, the downward force decreases, and the restoring force against the heel is lost, making the hull dangerous. The dot was hot.

[Means for solving problems]

The present invention aims to solve such problems and provide a wing keel structure of a new concept for a boat hull that has extremely high stability against the heel. The front part is cut out in a triangular shape, and a rotating shaft is supported so that it can rotate around the axis along the sloping end of the cutout, and a wing is attached to the lower end of the rotating shaft when the keel is in the vertical direction. The wing is fixed so as to be substantially horizontal, and a weight is fixed to the front part of the wing so that the center of gravity of the entire wing is located considerably forward of the fixed end of the wing and the rotating shaft. It is in the wing keel structure of the hull.

[Effect]

In the present invention, when the waves and wind are weak, the keel is in the vertical direction and the wing is in a substantially horizontal state parallel to the sea surface, and a downward force is generated on the wing according to its angle of attack, airfoil shape, and speed. This acts to pull the hull into the sea, making the hull stable and maneuverable.

Next, if the hull heels significantly due to strong waves or wind, both the keel and wing will tilt in the horizontal direction, but the wing will turn around the axis of rotation to the heeled side due to the moment due to its weight.
The center of gravity of the entire wing is located vertically below the axis of rotation. If the boat runs in this state, a large negative angle of attack will occur between the wing and the running direction, that is, the direction of the water flow, and a large downward force will be generated on the wing in the vertical direction by the water flow, causing the boat to It acts as a restoring moment against the heel of the boat, raises the hull, and exhibits high resilience against the heel during large waves and turbulence.

〔Example〕

In the embodiment shown in Figs. 1 to 4, the lower part of the keel 1 is omitted.
Wing 2 is a wing plate that is cut out at a 45° inclination angle and has its maximum width at a position 30 to 40% from its leading edge. Weight 3 has a large weight and is shaped like a cannonball. Insert the bolt so that it sticks out in front of the
It is attached by a nut (not shown).
In the figure, 4 is a hull, 5 is a rotating part, 6 is a bearing, and 7 is a mast.

Figures 1 and 2 show sailing conditions when waves and wind are weak. In this state, the wing is generating a moderate downward force at a small angle of attack. Figures 3 and 4 show the inclination of the hull 4, wing 2, and weight 3 when the boat heels significantly. Wing 2 makes a large turn in the direction of the heel, and Wing 2
and the water flow generates a large angle of attack. In FIG. 3, "○×" and arrows indicate the direction of water flow. The state shown in FIG. 3 will be explained. If the hull 4, which is sailing straight ahead in the conditions shown in Figures 1 and 2, rotates (tilts) around a straight line connecting the bow and stern at the center of gravity of the hull as shown in Figure 3, then the hull 4. The keel 1 and the rotating shaft 5 rotate and tilt integrally around the above-mentioned straight line. At this time, since the wing 2 and the weight 3 are also fixed to the rotating shaft, they rotate and tilt together with the keel 1 around the above-mentioned straight line. When the weight 3 is tilted, the center of gravity of the weight 3 is not vertically below the rotating shaft 5, but is offset from the vertical plane of the rotating shaft 5. Therefore, due to the moment due to the weight of the weight 3, the center of gravity of the weight 3 is not vertically below the rotating shaft 5. The wing 2 and the weight 3 rotate around the axis of the rotating shaft 5 in the direction in which the wing 2 and the weight 3 rotate. Here, the rotating shaft 5 is mounted by a bearing 6 so as to be freely rotatable around its axis. Next, when the wing 2 rotates around the rotation axis 5,
The surface of wing 2 (the line connecting the tip and rear end of the wing) is now diagonal to the direction of travel of the boat (the line connecting the bow and stern of the boat), and the flow of water is now parallel to wing 2. It has a large angle of attack, and a large downward force (vertical force/force toward the seabed) acts on wing 2, and this is generated at an offset position on the opposite side of the boat's center of gravity, causing the boat to It acts as a restoring force. This provides a high resilience against tilting of the boat.

5, 6, and 7 show other examples of wing and weight shapes, in which the weight 3 is integrally attached to the front part of the oblong wing 2.

〔Effect of the invention〕

As described above, according to the present invention, since the wing is fixed to the rotating shaft end inclined at the lower end of the keel,
If the hull heels significantly, the wings will rotate, generating a large downward force and a moment to restore the hull, allowing the boat to recover from the large heel. Furthermore, since the downward force acts strongly in the heeled state, it has the excellent effect of maintaining course keeping performance.

[Brief explanation of drawings]

Fig. 1 is a side view showing an embodiment of the wing keel structure of the hull of the present invention, Fig. 2 is a sectional view taken from the line - Fig. 1, and Fig. 3 is a front view showing the heel state of the same embodiment. 4 is a side view of the same state, FIG. 5 is a plan view showing another example of the shape of the wing, FIG. 6 is a side view of the same, and FIG. 7 is a front view of the same. 1: Keel, 2: Wing, 3: Weight,
4: Hull, 5: Rotating shaft, 6: Bearing, 7: Mast.

Claims (1)

[Claims] 1 The lower front part of the keel that hangs down from the bottom of the hull is cut out in a triangular shape, and a rotating shaft is supported along the sloping end of the cut-out keel so that it can rotate around the axis, and the lower end of the rotating shaft is The wing is fixed so that the keel is approximately horizontal when it is in the vertical direction, and a weight is fixed to the front part of the wing so that the center of gravity of the entire wing is far forward of the fixed end between the rotation axis and the wing. A wing keel structure of a hull characterized by being in a state where it is located at.